This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Refractive index = 3/2
let speed of light in medium = v
speed of light in vacuum = 3×10⁸ m/s

refractive index of a medium = speed of light in vacuum/speed of light in medium
⇒3/2 = 3×10⁸/v
⇒v = 3×10⁸×2/3
⇒ v= 2×10⁸ m/s

Refractive index of amedium=speed of lightin vaccum/speed of light inmedium -glass    then speed of light in glass=v then 3/2=2.9 x10^8/v  3v=2.9 x10^8x2          v=5.8 x10^8/3 =1.9 x10^8m/s